| 巴颜喀拉块体北和东边界大地震序列的关联性与2008年汶川地震 |
| |
| 引用本文： | 闻学泽,杜方,张培震,龙锋.巴颜喀拉块体北和东边界大地震序列的关联性与2008年汶川地震[J].地球物理学报,2011,54(3):706-716. |
| |
| 作者姓名： | 闻学泽 杜方 张培震 龙锋 |
| |
| 作者单位： | 1. 中国地震局地震预测研究所,北京 100036;
2. 四川省地震局,成都 610041;
3. 中国地震局地质研究所地震动力学国家重点实验室,北京 100029 |
| |
| 基金项目： | 国家科技支撑计划重点课题,地震动力学国家重点实验室开放课题 |
| |
| 摘 要： | 2008年汶川地震发生在巴颜喀拉块体的东边界.为了探讨区域动力学背景与该地震发生的关系,本文基于活动构造、震源机制解、GPS站速度、地震破裂展布以及历史大地震活动等资料分析巴颜喀拉块体北、东两个边界断裂系统的运动、变形以及大地震序列发生的关联性.结果表明:由于受到华南地块的阻挡,巴颜喀拉块体朝东-南东方向的"逃逸"运动...
|
| 关 键 词： | 巴颜喀拉块体 边界断裂系统 大地震序列 构造动力学 汶川地震 |
| 收稿时间： | 2010-04-10 |
Correlation of major earthquake sequences on the northern and eastern boundaries of the Bayan Har block, and its relation to the 2008 Wenchuan earthquake |
| |
| WEN Xue-Ze,DU Fang,ZHANG Pei-Zhen,LONG Feng.Correlation of major earthquake sequences on the northern and eastern boundaries of the Bayan Har block, and its relation to the 2008 Wenchuan earthquake[J].Chinese Journal of Geophysics,2011,54(3):706-716. |
| |
| Authors: | WEN Xue-Ze DU Fang ZHANG Pei-Zhen LONG Feng |
| |
| Institution: | 1. Institute of Earthquake Science, China Earthquake Administration, Beijing 100036, China;
2. Earthquake Administration of Sichuan Province, Chengdu 610041, China;
3. State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China |
| |
| Abstract: | The 2008 Wenchuan earthquake occurred on the eastern boundary of the Bayan Har block. To understand better the regional dynamic environment and its relation to the earthquake, this research studies the kinematics and deformation of the fault systems of the northern and eastern boundaries of the block, as well as the correlation of occurrences of major earthquake sequences on the two boundaries, based on analyzing data from active tectonics, focal mechanism, GPS station velocity, earthquake rupture distribution and seismicity of historical major earthquakes. The result shows that, owing to the resistance of the South China block, the east- to southeast ward "extruding" movement of the Bayan Har block, which is manifested by the active left-lateral strike-slip faulting along the northern boundary of the block, is transformed into thrust faulting and lateral shortening with strike-slip faulting on the eastern boundary of the block. This suggests that the "extruding" movement of the block has been "loading on" the eastern boundary remarkably. Such loading is also presented in the correlation of occurrences of major earthquake sequences on the two fault systems of the northern and eastern boundaries of the block. From the middle to late 19th century to 2001, a sequence of 8 major events ruptured about 2/3 of the whole length of the northern boundary of the Bayan Har block. At the same time, the sequence has the characteristics of accelerating strain release and gradually shortening intervals between events, suggesting that the movement of the block has been speeding up since 1902 at the latest. As a response to this speeding-up movement, a sequence of 3 major events have occurred on the eastern boundary of the block since about 1933, which has also the characteristics of accelerating strain release and gradually shortening intervals between events. The 2008 Wenchuan earthquake is the most-recent event in the response sequence. The factor that the occurrence of the response sequence of major earthquakes on the eastern boundary is delayed for decades at least behind the sequence on the northern boundary would be associated with the non-rigid motion of the block. In addition, it is found that the event's order-number versus time relationships of the two sequences of major earthquakes are helpful in analyzing the mid- and long-term seismic potentials for the northern and eastern boundaries of the Bayan Har block. |
| |
| Keywords: | Bayan Har block Boundary fault system Major earthquake sequence Tectonic dynamics Wenchuan earthquake |
| 本文献已被 万方数据 等数据库收录！ |
| 点击此处可从《地球物理学报》浏览原始摘要信息 |
| 点击此处可从《地球物理学报》下载免费的PDF全文 |
|
